Bedienungsanleitung Mercedes CLA 2015 (Seite 336 von 362) (Englisch)

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Example:

Treadwear grade: 200

Traction grade: AA

Temperature grade: A

All passenger car tires must conform to the

statutory safety requirements in addition to

these grades.

The actual values for tires are vehicle-

specific and may deviate from the values in

the illustration.

Treadwear

The treadwear grade is a comparative rating

based on the wear rate of the tire when tested

under controlled conditions on a specified

U.S. government course. For example, a tire

graded 150 would wear one and one-half

times as well on the government course as a

tire graded 100.

The relative performance of tires depends

upon the actual conditions of their use, how-

ever, and may depart significantly from the

norm due to variations in driving habits, ser-

vice practices and differences in road char-

acteristics and climate.

Traction

WARNING

The traction grade assigned to this tire is

based on straight-ahead braking traction

tests, and does not include acceleration, cor-

nering, hydroplaning, or peak traction char-

acteristics.

Avoid wheelspin. This can lead to damage

to the drive train.

The traction grades – from highest to lowest –

are AA, A, B and C. Those grades represent

the tire's ability to stop on wet pavement as

measured under controlled conditions on

specified government test surfaces of asphalt

and concrete. A tire marked C may have poor

traction performance.

The safe speed on a wet, snow covered or icy

road is always lower than on dry road surfa-

ces.

You should pay special attention to road con-

ditions when temperatures are around freez-

ing point.

Mercedes-Benz recommends a minimum

tread depth of ã in (4 mm) on all four winter

tires. Observe the legally required minimum

tire tread depth (Y page 319). Winter tires can

reduce the braking distance on snow-covered

surfaces in comparison with summer tires.

The braking distance is still much further than

on surfaces that are not icy or covered with

snow. Take appropriate care when driving.

Further information on winter tires (M+S

tires) (Y page 320).

Temperature

WARNING

The temperature grade for this tire is estab-

lished for a tire that is properly inflated and

not overloaded. Excessive speed, underinfla-

tion, or excessive loading, either separately or

in combination, can cause excessive heat

build-up and possible tire failure.

The temperature grades are A (the highest), B,

and C, representing the tire's resistance to

the generation of heat and its ability to dissi-

pate heat when tested under controlled con-

ditions on a specified indoor laboratory test

wheel. Sustained high temperature can cause

the material of the tire to degenerate and

reduce tire life, and excessive temperature

can lead to sudden tire failure. The grade C

corresponds to a level of performance which

all passenger car tires must meet under the

Federal Motor Vehicle Safety Standard No.

109. Grades B and A represent higher levels

of performance on the laboratory test wheel

than the minimum required by law.

334

All about wheels and tires

Wheels and tires

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Mercedes CLA 2015 Seite 336

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